Question

1. which scenario best demonstrates the concept of specific heat in everyday life?

mark only one oval.
water taking longer to heat up than oil in a pan
a rock falling from a cliff
air pressure changing with altitude
ice melting at exactly 0°c

1. a thermos bottle works by preventing heat transfer. if the contents undergo an adiabatic process, what does this mean?

mark only one oval.
volume remains constant
no heat is exchanged with surroundings
temperature remains constant
pressure remains constant

1. when water boils at 100°c, energy is still being added but temperature doesnt increase. this energy is called:

mark only one oval.
specific heat
kinetic energy
latent heat
potential energy

Explanation:

• Question 13: Specific heat is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius. Water has a higher specific heat than oil. So, water taking longer to heat up than oil in a pan (as it needs more heat to increase its temperature) demonstrates specific heat. A rock falling from a cliff is related to gravitational potential energy converting to kinetic energy. Air pressure changing with altitude is related to atmospheric pressure concepts. Ice melting at exactly \(0^{\circ}C\) is related to latent heat of fusion.
• Question 14: In an adiabatic process, by definition, there is no heat exchange (\(Q = 0\)) between the system (contents of the thermos) and the surroundings. A process with constant volume is isochoric, with constant temperature is isothermal, and with constant pressure is isobaric.
• Question 15: When water is boiling at \(100^{\circ}C\), the added energy (latent heat of vaporization) is used to break the intermolecular forces and convert water from liquid to gas phase, without increasing the temperature. Specific heat is related to temperature change of a substance. Kinetic energy is the energy of motion of molecules (related to temperature for ideal gases in a simplistic sense, but here temperature is constant). Potential energy (in a general sense here) is not the term for the energy during phase - change at constant temperature.

Answer:

1. Water taking longer to heat up than oil in a pan
2. No heat is exchanged with surroundings
3. Latent heat